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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)

The components of the net periodic benefit cost (credit) for our plans were as follows:

 

 

 

3 Months Ended March 31,

 

 

 

Defined Benefit Pension Plans

 

 

Retiree Health Care Plan

 

 

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Service cost

 

$

5.6

 

 

$

5.1

 

 

$

—

 

 

$

—

 

Interest cost

 

 

1.5

 

 

 

2.3

 

 

 

0.1

 

 

 

0.1

 

Expected return on assets

 

 

(3.1

)

 

 

(3.4

)

 

 

—

 

 

 

—

 

Settlement loss

 

 

-

 

 

 

10.2

 

 

 

—

 

 

 

—

 

Other

 

 

1.4

 

 

 

0.9

 

 

 

(0.2

)

 

 

(0.2

)

Total benefit cost (credit)

 

$

5.4

 

 

$

15.1

 

 

$

(0.1

)

 

$

(0.1

)